How much lift with stock magnum roller lifters?

Cuda416 said

Hmm, ok, so it has to do with lash and the ability to bleed down fast enough to not cause a problem? That's starting to make sense, I hadn't thought of it that way. I suppose it's been staring me in the face since for hyd you set "preload" which is negative lash. Am I tracking that right? Having the hyd bleed down slow is bad since the "preload" needs to go away?

Thanks

Click to expand...

Yes. There has to be some way to allow a little wiggle room for high RPM operation, due to the lifters wanting to "take off" off of the peaks of the lobes as they go by. A sort of shock absorber for the valve train. The lash in a solid lifter valve train acts in the same way, but there's no hydraulic function to have to bleed down, so they can RPM higher and make more power due to the more aggressive ramps they are able to handle as a result.